Faults - WIKA TR21 Betriebsanleitung

8. Faults

8. Faults
Faults
GB
Not possible to insert the
temperature sensor into the
thermowell
Leakage of process media
at the connection between the
■
process and the thermowell
from the interface between the
■
thermowell and the sensor
In the case of critical installations, we recommend calculating the harmonic frequency of
the thermowell according to ASME PTC 19.3 or Dittrich/Klotter. This engineering service is
offered by WIKA.
CAUTION!
If faults cannot be eliminated by means of the measures listed above, the
instrument must be withdrawn from use immediately, it must be ensured that
there is no longer any pressure and/or signal and they must be prevented from
being inadvertently put back into service.
In this case, contact the manufacturer.
If a return is needed, follow the instructions given in chapter "9.2 Return".
16
Causes
Foreign bodies in the thermowell
Damaged or contaminated
thermowell or temperature sensor
fastening thread
Sensor dimension and those of the
inner diameter of the thermowell do
not match
Thermowell or sensor has been bent
or damaged during installation
Error during installation or defective
seals
Damage, e.g. caused by operating
the thermowell under a resonant
vibration load
Measures
Remove foreign bodies
Clean or recut the thread
Check order documentation
Return for repair
Check the seal, check the
tightening torques
Safe operation of the
plant can no longer be
guaranteed
(in the worst case, this
might result in a complete
rupture of the thermowell)
WIKA operating instructions model TR21